There's probably a word I've been pronouncing wrong my whole life that I don't know about
Just based on how often I notice someone mispronounce a word without realizing it (or have done so myself and realized it later). Statistically I'm probably still doing it with some word.
automaton — Noun: 1. A machine or robot designed to follow a precise sequence of instructions., 2. A person who acts like a machine or robot, often defined as having a monotonous lifestyle and lacking in emotion., 3. A formal system, such as a finite-state machine or cellular automaton., 4. A toy in the form of a mechanical figure. https://en.wiktionary.org/wiki/automaton